07-23-2011, 11:59 AM
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Unfortunately I don't think there is any, but the simple math of it is this: 1.5-2% of their body weight (so for a normal sized horse, between 15 and twenty pounds of hay/grass per day) in forage.
For hard feeds, it depends on the type of feed. There are feed charts on the back of every bag, and you will have to multiply the decimal (will say something like ".25-.50 pounds of feed for 100lb of body weight per day", which again with a 1000 pound horse is between 2.5 lbs and 5 lbs a day) by your individual horses body weight, according to how much work they do.